code: def test_detect(monkeypatch):
      """Test the detection of a xla environment configuration."""
      monkeypatch.setattr(
          lightning.fabric.accelerators.xla.XLAAccelerator,
          "is_available",
          lambda: False,
      )
      assert not XLAEnvironment.detect()
  
      monkeypatch.setattr(
          lightning.fabric.accelerators.xla.XLAAccelerator,
          "is_available",
          lambda: True,
      )
      assert XLAEnvironment.detect()
  
file_path: pytorch-lightning/tests/tests_fabric/plugins/environments/test_xla.py
imports: import os
  from unittest import mock
  import lightning.fabric
  import pytest
  from lightning.fabric.accelerators.xla import _XLA_GREATER_EQUAL_2_1
  from lightning.fabric.plugins.environments import XLAEnvironment
  from tests_fabric.helpers.runif import RunIf
label_desc: Use image node_id 3 for calling a global function with example usage: test_detect(monkeypatch) without return types